[mpich-discuss] quad core mpich2 sluggish

[Pavan Balaji]

Zach,

It's hard to tell what is going on based on the description below. Is 
your application thrashing memory/cache? Are you using the same problem 
size with increasing number of processes?

  -- Pavan

On 12/24/2010 12:33 PM, zach wrote:
> I am running the latest ubuntu with a Q6600 quad core cpu and the mpich2
> that came with ubuntu
> I can run my parallelized code over the four cores (i see it in 'top')
> however, the speed increase over a single process is hardly improved for
> 2,3, or even 4 processes.
>
> i was able to run the same code on a linux cluster through my school
> with speed increases as expected.
> am i doing something wrong?
>
> zach
>
>
>
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-- 
Pavan Balaji
http://www.mcs.anl.gov/~balaji